I changed the lamps and added a powerhead after the algae started to grow. I added 2 dozen snails & 2dozen hermit crabs for a total of 3 doz. each , and they really seme to be helping. Do you guys think I could add 3-4 doz. more of each. I have read not to keep more than one hermit crab for every 10 gallons. Thanks for all your advice.